Bruno Mars will get more than $1 million to perform at the bat mitzvah of New York City-based Russian oligarch Len Blavatnik's daughter.

“He is getting $250,000 per song and is planning to sing five songs,” a source told Confidenti@l.

Oy.

Blavatnik will pay for Mars and his entire crew, including his stylist and his band, to fly by private jet to New York for the big night, according to the New York Daily News.

“He insisted on his own band backing him,” a source told the paper. “Also, he will retain rights to all recordings of the performance, even though I have to think every yarmulke-clad teen at the party will instantly be posting clips of Bruno Mars playing a bat mitzvah.”

The News reported Mars felt pressure to do the gig, because he is signed to Atlantic Records, which is owned by Warner Music, which is owned by that's right — Len Blavatnik.

“The event will probably take place at the Plaza,” said the source. “Last Saturday, there was a sweet 16 party there where the lucky birthday girl enjoyed a three-song performance by Pharrell.

I wonder if David Hasselhoff would perform at my next birthday party for 10 bucks.

Blavatnik can afford it. He founded Access Industries, which invests in natural resources, chemicals, media, telecommunications and real estate. Forbes says he's worth $17.8 billion, and he was No. 2 on the Sunday Times of London's Rich List for 2013.